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Product pages » Queensland Dams and Waterbodies

Queensland Dams and Waterbodies

Last modified by Peter Scarth on 2012/03/23 13:45

Queensland Dams and Waterbodies

What does this data set describe?

Title: Queensland Dams and Waterbodies - QLD_DAM_WATERBODY
Abstract:
The data is a polygon feature class containing all water bodies identified within Queensland, projected using GDA94. The water bodies were mapped from a time series of Landsat 5 & 7 images, ranging in date from 1987 to 2009, (typically winter imagery of 1987, 1988, 1991, 1993, 1995, 1997, and yearly from 1999 to 2009). Classification was based on thresholding a standardised multiple-regression water index, so that the number of pixels included with water was maximized, and errors of commission minimised. The individual year outputs of this process were converted to a mean extent for all years, excluding flooding events, and vectorised into the ArcGIS format to produce the polygon feature class. The number of years each water body feature had water in it has been calculated, along with a percent value which is an indicator of persistence (this attribute is cumulative and accounts for the first date the feature was captured and the number of years for which imagery was not available for that feature). Additional attributes, including the name, primary use and owner/s of dams, have been incorporated into the final dataset, by matching features to point features from a database provided by Dam Safety (Department of Environment and Resource Management), where features were within 100m of waterbodies derived from satellite imagery. Additionally features smaller than 1875m2 (a group of 3x25m pixels or less) have been excluded from the dataset, to meet the requirement of identifying large dams in Queensland. Smaller dams may be mapped in a future project.
  1. How should this data set be cited?

    Department of Environment and Resource Management, Remote Sensing Centre, Environment�and�Resource Sciences, 10/10/10, Queensland Dams and Waterbodies - QLD_DAM_WATERBODY.Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 137.987720
    East_Bounding_Coordinate: 154.854640
    North_Bounding_Coordinate: -9.914840
    South_Bounding_Coordinate: -29.179480
  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1987
    Ending_Date: 2009
    Currentness_Reference:
    derived from typically winter imagery of 1987, 1988, 1991, 1993, 1995, 1997, and yearly from 1999 to 2009
  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    This is a Vector data set. It contains the following vector data types (SDTS terminology):


      • G-polygon (0)
    1. What coordinate system is used to represent geographic features?

    Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal Degree.

    The horizontal datum used is Geocentric Datum of Australia 1994 (EPSG ID 6283).
    The ellipsoid used is GRS 1980 (EPSG ID 7019).
    The semi-major axis of the ellipsoid used is 6378137.000000.
    The flattening of the ellipsoid used is 1/298.257222.


    1. Vertical_Coordinate_System_Definition:

      Altitude_System_Definition:

      Altitude_Resolution: 1.000000
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?

    SIRQRY.QLD_DAM_WATERBODY
    Feature class showing mean extent of water bodies and whether or not water was present for a particular year from 1986 to 2005, and the percentage of time water was present.

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.


    WP_86
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_86 is 1986). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    ValueDefinition
    1Water Present
    0Water not present
    -1Imagery not present

    WP_87
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_87 is 1987). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_88
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_88 is 1988). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_89
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_89 is 1989). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_90
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_90 is 1990). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_91
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_91 is 1991). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_92
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_92 is 1992). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_93
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_93 is 1993). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_94
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_94 is 1994). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_95
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_95 is 1995). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_96
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_96 is 1996). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_97
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_97 is 1997). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_98
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_98 is 1998). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_99
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_99 is 1999). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_00
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_00 is 2000). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_01
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_01 is 2001). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_02
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_02 is 2002). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_03
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_03 is 2003). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_04
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_04 is 2004). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    WP_05
    Attribute identifying whether or not a particular feature contained water. The last part of the field name indicates the year (e.g. WP_05 is 2005). Allowed values are: 1 - water present; 0 - Water not present; or -1 - Imagery not available for that year.
    FIRST
    The first year water was detected for a particular feature.
    PERCENT
    Percent of time when the dam has held water since the first year it was captured in imagery, and accounting for the number of years imagery was not available, i.e. If a feature was first captured in 1999 and was present every year since then, except for one year when there was no imagery, the percentage value would be 100%
    NO_YEARS
    The number of years the feature contained water.
    IMAGERY
    The number of years imagery was missing for a particular feature.
    DAM_ID
    identification number, taken from database provided by Dam Safety Project, Department of Environment and Resource Management
    SD_DAM_NAME
    Dam Name
    COMPANYNAME

    SD_STORAGE

    SD_LONGITUDE_G
    Degrees
    SD_LONGITUDE_M
    Minutes
    SD_LONGITUDE_S
    Seconds
    LONGITUDE
    Decimal Degrees
    SD_LATITUDE_G
    Degrees
    SD_LATITUDE_M
    Minutes
    SD_LATITUDE_S
    Seconds
    LATITUDE
    Decimal Degrees
    SD_REFERABLE_TYPE

    PC_HEIGHT_DATUM

    PC_CATCHMENT_AREA

    PC_STORAGE_CAPACITY

    FIA_PAR

    CURRENT_PAST
    Currency of Data
    EXPR1

    EXPR2

    EXPR3

    EXPR4

    SD_PURPOSE_TYPE

    SD_PURPOSE

    F_AREA
    Area in metres squared.
    ID

    SHAPE
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.


    SE_ANNO_CAD_DATA

    SHAPE.AREA
    Area of feature in internal units squared. (Source: ESRI)
    SHAPE.LEN
    Length of feature in internal units. (Source: ESRI)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Department of Environment and Resource Management, Remote Sensing Centre, Environment�and�Resource Sciences
  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Harris Dave
    Department of Environment and Resource Management
    Content Authority
    QCCA Building
    Brisbane, Queensland 4068
    Australia(07) 3896 9589 (voice)
    (07) 3896 9606 (FAX)
    Tim.Danaher@derm.qld.gov.au


Why was the data set created?

To provide a state-wide water body coverage, showing the spatial extent and location of all large dams in Queensland, which can be used in applications requiring the determination of water body existence and their persistence.


How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)

  2. How were the data generated, processed, and modified?

    (process 1 of 4)
    Data Custodian nominated.

    Person who carried out this activity:

    Data Custodian (GM Water Industry Regulation)
    Department of Environment and Resource Management
    General Manager, Water Industry Compliance
    GPO Box 2454
    Brisbane, Queensland 4001
    Australia(07) 3224 2898 (voice)
    (07) 3224 2187 (FAX)
    Bob.Reilly@derm.qld.gov.au

    (process 2 of 4)
    Layer Controller nominated.

    Person who carried out this activity:

    Vowles Chris
    Department of Environment and Resource Management
    Layer Controller
    Level 3, Block C,
    Brisbane, Queensland 4068
    Australia(07) 3896 9873 (voice)
    (07) 3896 9782 (FAX)
    Chris.Vowles@derm.qld.gov.au

    (process 3 of 4)
    Content Authority nominated.

    Person who carried out this activity:

    Danaher Tim
    Department of Environment and Resource Management
    Content Authority
    QCCA Building
    Brisbane, Queensland 4068
    Australia(07) 3896 9589 (voice)
    (07) 3896 9606 (FAX)
    Tim.Danaher@derm.qld.gov.au

    (process 4 of 4)
    Information Management Authority nominated.

    Person who carried out this activity:

    NRSc Data Coordinator
    Department of Environment and Resource Management
    Information Management Authority
    Level 3, Block C,
    Brisbane, Queensland 4068
    Australia(07) 3896 9745 (voice)
    (07) 3896 9782 (FAX)
    NRScDataCoordinator@derm.qld.gov.au

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Restricted to all levels of government and community agencies. Dataset is available for use by Federal, State and Local government agencies, and community groups under a signed licence agreement. Dataset is available through physical supply and may be made available to registered users via web delivery tools, for example, through an access controlled internet site like the NRM RIS.
Use_Constraints: None.
  1. Who distributes the data set? (Distributor 1 of 1)

    NRSc Data Coordinator
    Department of Environment and Resource Management
    Information Management Authority
    Level 3, Block C,
    Brisbane, Queensland 4068
    Australia(07) 3896 9745 (voice)
    (07) 3896 9782 (FAX)
    NRScDataCoordinator@derm.qld.gov.au

  2. What's the catalog number I need to order this data set?Downloadable Data

  3. What legal disclaimers am I supposed to read?

    While every care is taken to ensure the accuracy of this information, the Department of Environment and Resource Management makes no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and disclaims all responsibility and all liability (including without limitation, liability in negligence) for all expenses, losses, damages (including indirect or consequential damage) and costs which might be incured as a result of the information being inaccurate or incomplete in any way and for any reason.
    © The State of Queensland (Department of Environment and Resource Management) <year of publication>.

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Created by Peter Scarth on 2012/03/23 12:08

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